Girls' Generation's first sub-unit, Taetiseo, which is compromised of Taeyeon, Tiffany and Seohyun, had their 2nd debut stage on KBS Music Bank and performed their title track, "Twinkle." During the performance, netizens sharp eyes caught Taeyeon's mistake during the live stage.

Wearing their dark, but sparkling clothings, Taeyeon began to sing her solo part, but followed the wrong part of the choreography, committing a cute mistake. During the broadcast, Taeyeon's bewildered expression became the center of attention of netizens.

Netizens who caught her mistake commented, "Taengu is only one person," "I found the mistake because of her expression" and "It's a cute mistake from Taeyeon."